Hello people. I need help finding a trap doujin that I can't remember where it was, I only remember the premise of it. Basically, what happens is a kid hears a rumor about a room/stall that a trap leaves a ribbon on and if you give the door a secret knock, the trap brings you in for sex. And at the end of the story, the protagonist wakes up, a wig is left behind, and then the protagonist thus becomes the trap for the next person that comes to the stall. If anyone has the slighting clue what I'm talking about, please help me out, thank you.